如何使用 AES-256 加密对整个文件进行加密？

Question

我的捆绑包中有一个 SQL 数据库文件。我需要使用 AES-256 加密该文件，并且需要将此数据写入另一个文件。

我已经尝试过使用 RNCryptor 和 CryptoSwift，但是，我要为我的问题找到准确的解决方案。

Answer 1

只需将任何文件读取为Data 或NSData 实例并对其应用加密并使用自定义扩展名回写即可。您可以使用@Ashish Rana 或https://gist.github.com/hfossli/7165dc023a10046e2322b0ce74c596f8 建议的lib

1. 从文件加载数据 guard let fileURL = Bundle.main.url(forResource: "file-to-be-encrypted", withExtension: "txt") else { return } guard let fileData = try? Data(contentsOf: fileURL) else { return }

2. 应用加密 let encrypted = try aes.encrypt(digest)

3. 保存加密文件 try encrypted.write(to: encURL)

如果您不想共享加密文件而只想保护它，那么您可以使用此处提到的操作系统基础加密：https://www.tomsguide.com/us/how-to-encrypt-ios,news-18338.html

Answer 2

同时使用AES256Crypter 和Rijndael，我得到了AES-256 加密和解密。

从此链接添加代码：https://github.com/superk589/RijndaelSwift

class StringCipher {

    static func Encrypt(plainText : String,  passPhrase : String) -> String {

        var result = ""
        let salt = AES256Crypter.randomSalt()
        let iv = AES256Crypter.randomSalt()

        let saltByte = [UInt8](salt)
        let ivByte = [UInt8](iv)
        do {
            let key = try AES256Crypter.createKey(password: passPhrase.data(using: .utf8)!, salt: salt)
            let r = Rijndael(key: key, mode: .cbc)!
            let decryptedData = r.encrypt(data: plainText.trimmed().data(using: .utf8)!, blockSize: 32, iv: iv)
            let dataBypte = [UInt8](decryptedData!)
            let mainByte = saltByte + ivByte + dataBypte
           // print(mainByte.count)

            let plainData = Data(bytes: mainByte)
            result = (plainData.base64EncodedString())
           // print(result)
        }
        catch {
            print("Failed")
            print(error)
        }
        return result
    }
    static func Decrypt( cipherText : String,  passPhrase : String) -> String {

        var result = ""

        do {
            let bData = cipherText.data(using: .utf8)!
            if let nsData = NSData(base64Encoded: cipherText, options: .ignoreUnknownCharacters) {
                let bytes = [UInt8](nsData as Data)
               // print(bytes, String(bytes: bytes, encoding: .utf8))
               // print(bytes.count)
                let subArray1 = bytes[0...31]
                let subArray2 = bytes[32...63]
                let subArray3 = bytes[64...(bytes.count-1)]

                let saltData = Data(bytes: subArray1)
                let ivData = Data(bytes: subArray2)
                let plainData = Data(bytes: subArray3)

               /*
                print("salt === \(saltData.base64EncodedString())\n\n")
                print("IV === \(ivData.base64EncodedString())\n\n")
                print("Data === \(plainData.base64EncodedString())\n\n")
                */

                let key = try AES256Crypter.createKey(password: passPhrase.data(using: .utf8)!, salt: saltData)
                print(key.count)

                let r = Rijndael(key: key, mode: .cbc)!

                let decryptedData = r.decrypt(data: plainData, blockSize: 32, iv: ivData)
              //  print("Original: \(String(decoding: decryptedData!, as: UTF8.self))")
                result = (String(decoding: decryptedData!, as: UTF8.self)).trimmed()

            }

        } catch {
            print("Failed")
            print(error)
        }
        return result
    }
}